Add distributor per labelset received samples metric (#6443) #10781

Job	Run time
CodeQL	7m 7s
CodeQL	7m 7s
lint	4m 32s
lint	4m 32s
test	15m 56s
test	16m 2s
build	4m 12s
build	4m 12s
test-no-race	7m 28s
test-no-race	7m 32s
integration-configs-db	2m 51s
integration-configs-db	2m 51s
integration (requires_docker)	7m 40s
integration (requires_docker)	7m 40s
integration (integration_alertmanager)	4m 21s
integration (integration_alertmanager)	4m 21s
integration (integration_backward_compatibility)	10m 18s
integration (integration_backward_compatibility)	10m 18s
integration (integration_memberlist)	7m 27s
integration (integration_memberlist)	7m 27s
integration (integration_querier)	15m 13s
integration (integration_querier)	15m 13s
integration (integration_ruler)	5m 50s
integration (integration_ruler)	5m 50s
integration (integration_query_fuzz)	4m 41s
integration (integration_query_fuzz)	4m 41s
deploy_website	0s
deploy_website	56s
deploy	0s
deploy	3m 36s
	3h 19m 54s

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